本文選題：擴頻通信技術(shù)　切入點：FPGA　出處：《南京理工大學(xué)》2014年碩士論文

【摘要】：基于擴頻技術(shù)的雷達通信信號處理實現(xiàn)是以雷達系統(tǒng)中的通信系統(tǒng)為研究背景,通過擴頻調(diào)制技術(shù)完成雷達與相關(guān)受控設(shè)備之間的通信。擴頻調(diào)制技術(shù)因為其良好的抗干擾性能和隱蔽性,在其誕生之初就是應(yīng)用于軍事領(lǐng)域,近年來得到了飛速的發(fā)展,將它運用到雷達通信系統(tǒng)當(dāng)中,也是完全符合雷達通信系統(tǒng)隱蔽通信和對抗電子干擾的需求。 本文在開始階段根據(jù)雷達通信系統(tǒng)的結(jié)構(gòu),設(shè)計了系統(tǒng)發(fā)送端與接收端的通信流程；緊接著討論了擴頻通信技術(shù)的理論基礎(chǔ)和關(guān)鍵技術(shù),并根據(jù)雷達通信系統(tǒng)的實際情況選擇了擴頻方式、擴頻碼和同步方式。之后根據(jù)系統(tǒng)的要求設(shè)計了一個基于spartan-6FPGA的硬件平臺,繪制并完成了PCB。然后重點討論了如何在這個硬件平臺上配合ISE軟件平臺和VHDL語言完成設(shè)計的通信流程并恢復(fù)信息。系統(tǒng)發(fā)送端采用m序列進行直接擴頻,經(jīng)過2DPSK調(diào)制發(fā)送信息,接收端采用差分相干解調(diào)、匹配濾波器解擴和恒虛警判決來恢復(fù)信息。最后,將通過示波器和chipscope觀察到的收發(fā)兩端的硬件調(diào)試結(jié)果與matlab、modelsim的仿真結(jié)果相比較,驗證了本文從系統(tǒng)流程設(shè)計、硬件平臺的搭建到軟件算法的正確性,達到了實時通信的目的。
[Abstract]:The realization of radar communication signal processing based on spread spectrum technology is based on the communication system of radar system. Communication between radar and related controlled equipment is accomplished by spread spectrum modulation technology. Because of its good anti-jamming performance and concealment, spread spectrum modulation technology was applied in military field at the beginning of its birth, and has been developed rapidly in recent years. Applying it to radar communication system is also in line with the requirements of hidden communication and electronic jamming in radar communication system. In the beginning, according to the structure of radar communication system, this paper designs the communication flow between transmitter and receiver, and then discusses the theoretical foundation and key technology of spread spectrum communication. According to the actual situation of radar communication system, the spread spectrum mode, spread spectrum code and synchronization mode are selected. Then, according to the requirements of the system, a hardware platform based on spartan-6FPGA is designed. Then it discusses how to complete the communication flow and restore information with ISE software platform and VHDL language on this hardware platform. The system uses m sequence to spread spectrum directly, and transmits information through 2DPSK modulation. The receiver uses differential coherent demodulation, matched filter despreading and CFAR decision to recover information. Finally, the hardware debugging results observed by oscilloscope and chipscope are compared with the simulation results of MATLAB modelsim. The correctness of the system flow design, hardware platform construction and software algorithm is verified in this paper, and the aim of real-time communication is achieved.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN957.51

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